2023 Annual Program Report: 25 Years of RBV Sampling!
Common stonefly (Perlidae)
Connecticut is fortunate to be a water-rich state, home to over 7,772 miles of rivers and streams. One of the CT DEEP Monitoring and Assessment Program’s (MAP) primary tasks is to conduct water quality monitoring to evaluate the physical, chemical and biological conditions of all waters in the State as part of Clean Water Act (CWA) requirements. Given limited staff resources, this wealth of water resources presents a challenge to achieve this CWA goal. One way MAP has enhanced assessments is by utilizing citizen scientist data to work towards this goal.
In 1999, the MAP developed a citizen science program, called the Riffle Bioassessment by Volunteers (RBV) Program, where trained volunteers collect benthic macroinvertebrate data from wadeable streams. 2023 marked the 25th consecutive sampling year for RBV program data. Thank you all for your hard work over these past 25 years - we would not be here without you!
A Treasure Hunt for CT’s Healthiest Streams!
The CT DEEP Riffle Bioassessment by Volunteers or “RBV” Program is an annual fall ‘treasure hunt’ for Connecticut’s healthiest streams. CT DEEP uses the data collected by RBV volunteers to expand its inventory of excellent small, high gradient Connecticut streams that have excellent water quality – our “Healthy Streams” list.
RBV volunteers examine the water quality of local stream segments by studying the aquatic benthic macroinvertebrate community present in rocky or ‘riffle’ areas of these streams. If volunteers can find four or more pollution sensitive or ‘most wanted’ macroinvertebrates, CT DEEP can use this data to assess that stream as fully supporting water quality standards for aquatic life use – documenting it as one of CT’s healthiest streams!
Because it is a screening approach and not a more in-depth assessment methodology, RBV cannot provide a detailed water quality assessment, nor can it be used to identify low or impaired water quality.
Above: volunteers taking RBV samples in Wood Creek, Bethlehem. Photo
courtesy of the Pomperaug River Watershed Coalition.
2023 Local RBV Programs & Leaders
Local RBV Programs ensure that the statewide RBV program is a success each year. Local RBV Coordinators put countless hours into organizing their programs, communicating with DEEP, recruiting and training volunteers, and more.
| Local RBV Program | Leaders |
|---|---|
| Washington Montessori School | Tom Fahsbender |
| Vernon Conservation Commission | Tom Oullette |
| Bolton Conservation Commission | Rod Parlee & Peter Van Dine |
| Pomperaug River Watershed Coalition | Carol Haskins |
| Salmon River Watershed Partnership | Patricia Young |
| Eightmile River Wild & Scenic Watershed | Patricia Young |
| Three Rivers Community College | Diba Khan Bureau |
| Farmington River Watershed Association | Heather Geist |
| Greenwich Inland Wetlands & Watercourses Agency | Jennifer Urena |
| The Last Green Valley | Jean Pillo |
| Trout Unlimited - Candlewood Valley Chapter | Joe Hovious & Paul Shafer |
| East Lyme Commission for the Conservation of Natural Resources | Penny Howell & Don Danila |
| Greenwich Country Day School | Nikki Barratt |
Thank you Jean!
Congratulations to Jean Pillo on your well-deserved retirement! Jean Pillo has been focusing on water quality issues since 2006, when she joined the National Heritage Corridor and began partnering with the Eastern Connecticut Conservation District. Jean’s work as The Last Green Valley Volunteer Water Quality Monitoring Coordinator has been integral to the success of the RBV program in Northeastern Connecticut. Thank you for all your hard work over these many years!
2023 Monitoring Results
The 2023 RBV monitoring program faced numerous challenges, including CT DEEP staffing changes, near-record breaking amounts of rainfall, and corresponding high flows. Despite less than ideal sampling conditions, the program continued to have a positive impact and contributed meaningful data to the Department of Energy and Environmental Protection.
RBV volunteers collected 59 vouchers from 55 unique locations on 53 different waterbodies. 30 (51%) of the 2023 monitoring vouchers had 4 or more taxa types in the ‘most wanted’ category, indicating that these stream segments are among Connecticut’s healthiest streams.
Table 1: Summary of Results, 2016-2023
| Category | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|
| # RBV Samples Submitted | 70 | 78 | 55 | 118 | 47 | 80 | 66 | 59 |
| # Monitoring Stations | 61 | 74 | 45 | 102 | 41 | 73 | 59 | 55 |
| # Streams Monitored | 55 | 61 | 43 | 89 | 36 | 65 | 52 | 53 |
| # Samples w/ 4+ "Most Wanted" Types | 21 | 43 | 23 | 62 | 16 | 52 | 28 | 30 |
| % of Samples w/ 4+ "Most Wanted" Types | 30% | 55% | 42% | 53% | 34% | 65% | 43% | 51% |
Above: volunteers receiving training at Salmon Brook, East Granby. Photo
courtesy of the Farmington River Watershed Association.
2023 Results Map
This interactive map depicts the number of ‘Most Wanted’ macroinvertebrate types present in RBV voucher samples from only 2023 samples. Mouse over the site icon to see the monitoring ID, waterbody name, and count of most wanted taxa.
Sites are assessed to be ‘healthy’ (★) if 4 or more ‘most wanted’ macroinvertebrate taxa were present. View the full Volunteer Monitoring Mapping Application to see the results from all 25 years of monitoring.
Table 2: Most Wanted Counts by Site
This table provides a list of most wanted counts by site. The table is sorted according to waterbody name, site ID, and then the date the sample was collected.
A detailed list of all monitoring sites, most wanted counts and the complete RBV taxa list for each can be downloaded from the Water Quality Portal.
| Waterbody Name | Station ID | Date Collected | Most Wanted Count |
|---|---|---|---|
| Baker Brook | 18821 | 10/29/2023 | 0 |
| Barbour Brook | 16379 | 10/8/2023 | 1 |
| Barrows Brook | 15594 | 10/28/2023 | 3 |
| Beaver Brook | 15680 | 9/20/2023 | 5 |
| Big Brook | 17992 | 9/6/2023 | 2 |
| Blackledge River | 19455 | 10/17/2023 | 3 |
| Brothers Brook | 20888 | 11/9/2023 | 0 |
| Burlington Fish Hatchery | 14608 | 10/14/2023 | 2 |
| Burnham Brook | 20492 | 5/5/2023 | 2 |
| Burnham Brook | 20882 | 11/3/2023 | 4 |
| Carmel Hill Brook | 20486 | 9/17/2023 | 4 |
| Cedar Pond Brook | 15501 | 10/27/2023 | 2 |
| Conantville Brook | 20877 | 11/15/2023 | 4 |
| Cooks Pond outlet; unnamed brook | 20878 | 10/23/2023 | 0 |
| Cranberry Meadow Brook | 20375 | 10/31/2023 | 3 |
| East Meadow Brook | 18993 | 9/16/2023 | 3 |
| Elbow Brook | 20881 | 10/1/2023 | 5 |
| English Neighborhood Brook | 17867 | 11/12/2023 | 7 |
| Fawn Brook | 18409 | 10/17/2023 | 4 |
| Flat Brook | 16121 | 9/16/2023 | 4 |
| Fourmile River | 17322 | 10/24/2023 | 2 |
| Fraser Brook | 18961 | 4/28/2023 | 4 |
| Fraser Brook | 20884 | 11/3/2023 | 2 |
| Greenwich Creek | 20889 | 11/28/2023 | 0 |
| Harris Brook | 15313 | 4/28/2023 | 4 |
| Harris Brook | 19214 | 4/28/2023 | 6 |
| Harris Brook | 19214 | 10/27/2023 | 3 |
| Harris Brook | 20883 | 11/3/2023 | 4 |
| Hedge Brook | 20126 | 5/5/2023 | 3 |
| Hedge Brook | 20126 | 11/3/2023 | 2 |
| Indian Meadow Brook | 14842 | 10/16/2023 | 8 |
| Latimer Brook | 18413 | 10/24/2023 | 2 |
| Latimer Brook | 18495 | 10/24/2023 | 3 |
| Little Dam Tavern Brook | 20876 | 11/16/2023 | 4 |
| Moodus River | 18871 | 11/12/2023 | 4 |
| Moosehorn Brook | 16861 | 10/31/2023 | 3 |
| Morgan Brook | 20887 | 9/17/2023 | 5 |
| Muddy Brook | 18694 | 5/5/2023 | 4 |
| NNT to Bunnell Brook | 20666 | 10/4/2023 | 5 |
| NNT to East Branch Eightmile River | 19215 | 4/28/2023 | 3 |
| NNT to East Branch Eightmile River | 19215 | 10/27/2023 | 3 |
| NNT to Eightmile at Pleasant Valley Preserve | 15314 | 5/5/2023 | 2 |
| NNT to Eightmile at Pleasant Valley Preserve | 15314 | 10/27/2023 | 2 |
| NNT to Farmington River | 20885 | 9/19/2023 | 5 |
| NNT to Salmon River | 20373 | 9/9/2023 | 4 |
| NNT to Shepaug River | 18922 | 9/25/2023 | 2 |
| Peake Road | 17650 | 10/26/2023 | 7 |
| Peckham Brook | 17731 | 10/16/2023 | 5 |
| Pine Brook | 14396 | 10/18/2023 | 4 |
| Railroad Brook | 16995 | 10/28/2023 | 4 |
| Raymond Brook | 16999 | 10/29/2023 | 5 |
| Reichenback Brook | 20154 | 9/16/2023 | 3 |
| Rickenback Brook | 20371 | 10/28/2023 | 1 |
| Safford Brook | 20880 | 11/17/2023 | 10 |
| Salmon Brook | 14435 | 9/2/2023 | 4 |
| Salmon River | 17022 | 9/9/2023 | 4 |
| Scranton Brook | 20879 | 11/30/2023 | 9 |
| Thompson Brook | 20886 | 10/26/2023 | 2 |
| Wood Creek | 17333 | 9/16/2023 | 8 |
Interpreting Your Results
Refer to Table 3 for guidance on how to interpret your monitoring results.
Table 3: Interpretation of RBV Results by Most Wanted Count
| # ‘Most Wanted’ Taxa | What Does it Tell Us? |
| 4+ |
Excellent!! Lots of very sensitive macroinvertebrate types were
present – you found a healthy stream segment! This is a very clear signal of excellent water quality as the ‘Most Wanted’ types cannot survive in degraded streams or otherwise low water quality conditions. DEEP Assessment Decision: The stream containing the monitoring location will be considered for ‘Fully Supporting’ State aquatic life use standards. Fully supporting streams or stream segments will be listed in the next Integrated Water Quality Report (IWQR) and added to the DEEP’s running list of miles of Healthy Waters assessed. Recommended Volunteer Follow-Up Action: Revisit every 2 to 5 years to continue documenting the excellent health of this stream. |
| 3 |
A Very Good Sign – Keep this Site on Your Radar! Three Most Wanted or very sensitive macroinvertebrate types in a sample is a strong signal of good to excellent water quality. Although three most wanted is not statistically enough data for DEEP to list the site as a healthy stream segment this time, this is a great find! DEEP Assessment Decision: No Assessment Made… but consider trying again! Recommended Volunteer Follow-Up Action: If this was the first time the site was monitored with RBV, this site should be a high priority candidate for next season. |
| 0-2 |
Double check whether this is a good spot to be using the RBV
method… More information is needed to determine the water quality at this site. Reasons for few most wanted could include poor water quality; however, few most wanted types should not be interpreted as a proof of degraded conditions. Other factors such as unusual flow conditions and lack of adequate habitat can also result in few most wanted types despite overall good water quality. DEEP Assessment Decision: No Assessment Made Recommended Volunteer Follow-Up Action: Discuss with the State RBV Coordinator whether you should revisit this site in future monitoring seasons. |
2023 RBV Data Impact
The 2023 RBV results will be consolidated into the 2026 Integrated Water Quality Report. A ‘healthy’ river or stream is one that fully supports a variety of uses, including aquatic life use.
In 2023, RBV volunteers monitored 53 waterbodies in Connecticut. Based on the results reported in the previous section, RBV data is likely to generate 9 new listings of Connecticut waterbodies that fully support aquatic life use:
NNT to Bunnell Brook (Burlington)
NNT to Farmington Rivern (Barkhamsted)
Fraser Brook (Salem)
NNT to Salmon River (East Hampton)
Conantville Brook (Mansfield)
Scranton Brook (Union)
Safford Brook (Woodstock)
Peake Brook (Woodstock)
Little Dam Tavern Brook (Putnam)
Appendix A: 2023 RBV Monitoring Station Description & Details
| Station ID | Waterbody Name | Municipality | Description | Latitude | Longitude |
|---|---|---|---|---|---|
| 14396 | Pine Brook | HADDAM | at old bridge Pine Brook Road | 41.50790 | -72.49520 |
| 14435 | Salmon Brook | EAST GRANBY | adjacent Granbrook Park | 41.93660 | -72.77490 |
| 14608 | Burlington Fish Hatchery | BURLINGTON | at hatchery | 41.76890 | -72.95420 |
| 14842 | Indian Meadow Brook | WINCHESTER | between Route 44 crossing and end of Loomis Street | 41.93050 | -73.07900 |
| 15313 | Harris Brook | SALEM | at Mouth (within Walden Preserve) | 41.47330 | -72.28510 |
| 15314 | Eightmile River, Unnamed tributary to ("PV Brook") | LYME | at trail crossing off MacIntosh Road (Pleasant Valley Preserve) | 41.41550 | -72.33960 |
| 15314 | Eightmile River, Unnamed tributary to ("PV Brook") | LYME | at trail crossing off MacIntosh Road (Pleasant Valley Preserve) | 41.41550 | -72.33960 |
| 15501 | Cedar Pond Brook | LYME | DS Beaver Brook Road, near #134 | 41.41190 | -72.31280 |
| 15594 | Barrows Brook | VERNON | upstream Confluence with Tankerhoosen | 41.84020 | -72.43650 |
| 15680 | Beaver Brook | BARKHAMSTED | upstream Beaver Brook Road in State Forest | 41.95130 | -72.99580 |
| 16121 | Flat Brook | EAST HAMPTON | at Route 16 (at mouth) | 41.55440 | -72.45230 |
| 16379 | Barbour Brook | CANTON | upstream Barbourtown road | 41.86060 | -72.91320 |
| 16861 | Moosehorn Brook | GRANBY | at Moosehorn Road | 41.97486 | -72.87221 |
| 16995 | Railroad Brook | VERNON | US tankerhoosen river DS Bread and Milk Road | 41.82772 | -72.44828 |
| 16999 | Raymond Brook | HEBRON | DS Grayville Rd | 41.61280 | -72.36810 |
| 17022 | Salmon River | COLCHESTER | US of bigelow brook in salmon river SF | 41.54832 | -72.45162 |
| 17322 | Fourmile River | EAST LYME | at spring rock road | 41.33900 | -72.25920 |
| 17333 | Wood Creek | BETHLEHEM | at Route 132 | 41.62750 | -73.22570 |
| 17650 | Peake Brook | WOODSTOCK | at Butts Road Crossing | 41.92526 | -71.94692 |
| 17731 | Peckham Brook | WOODSTOCK | access behind #100 paine district road | 41.97708 | -71.96291 |
| 17867 | English Neighborhood Brook | WOODSTOCK | PARALLEL TO LYONS RD, 100M BELOW POND | 41.99800 | -72.02010 |
| 17992 | Big Brook | SALEM | UPSTREAM OF RTE 85 | 41.50446 | -72.28783 |
| 18409 | Fawn Brook | MARLBOROUGH | Downstream Old Hartford Road/S. Main Street (at mouth) | 41.60458 | -72.41875 |
| 18413 | Latimer Brook | EAST LYME | 50m Upstream Colony Road | 41.38397 | -72.21429 |
| 18495 | Latimer Brook | EAST LYME | US Route 1, behind Flanders Plaza | 41.36726 | -72.20808 |
| 18694 | Muddy Brook | EAST HADDAM | US 100m of Hopyard Rd. | 41.47597 | -72.34292 |
| 18821 | Baker Brook (East branch headwaters) | BOLTON | Downstream School Road | 41.74794 | -72.42410 |
| 18871 | Moodus River | EAST HADDAM | 25m US of Gristmill Rd Crossing | 41.50859 | -72.44826 |
| 18922 | Shepaug River, Unnamed Tributary to | WASHINGTON | 100 m US mouth | 41.62301 | -73.32809 |
| 18961 | Fraser Brook | SALEM | at Salem Community Park | 41.48108 | -72.25275 |
| 18993 | East Meadow Brook | WOODBURY | at Scratchville Road (Strong Preserve) | 41.55509 | -73.19706 |
| 19214 | Harris Brook | SALEM | 0.25 mi upstream Music Vale Rd | 41.48739 | -72.27044 |
| 19214 | Harris Brook | SALEM | 0.25 mi upstream Music Vale Rd | 41.48739 | -72.27044 |
| 19215 | East Branch Eightmile River, Unnamed tributary to ("Ransom Brook") | SALEM | 30m downstream Darling Rd ("Bingham Property") | 41.45494 | -72.28356 |
| 19215 | East Branch Eightmile River, Unnamed tributary to ("Ransom Brook") | SALEM | 30m downstream Darling Rd ("Bingham Property") | 41.45494 | -72.28356 |
| 19455 | Blackledge River | MARLBOROUGH | 30m upstreamFawn Brook, near Kellogg Rd/South Main St | 41.60413 | -72.41969 |
| 20126 | Hedge Brook | EAST HADDAM | At West Dolbia Hill Road | 41.45207 | -72.33766 |
| 20126 | Hedge Brook | EAST HADDAM | At West Dolbia Hill Road | 41.45207 | -72.33766 |
| 20154 | Reichenback Brook | WOODBURY | at Mill Road | 41.57585 | -73.17105 |
| 20371 | Rickenback Brook | VERNON | 50m either side of Belding WMA yellow trail bridge | 41.83361 | -72.44306 |
| 20373 | Salmon River, Unnamed tributary to | EAST HAMPTON | 100 ft. upstream of Salmon River confluence | 41.54838 | -72.45101 |
| 20375 | Cranberry Meadow Brook | EAST LYME | Within Nehantic State Forest, off Grassy Hill Rd (100 yds. southwest of pasture) | 41.41490 | -72.24536 |
| 20486 | Carmel Hill Brook | WOODBURY | Within Marzahl Refuge, upstream of walking bridge (Near Carmel Hill Rd/Weekeepeee Rd. intersection) | 41.59224 | -73.23900 |
| 20492 | Burnham Brook | EAST HADDAM | Adjacent trail within Burnam Brook Preserve | 41.46530 | -72.32450 |
| 20666 | Bunnell Brook, Unnamed tributary to | Burlington | Behind Lewis Mill High School and Hal-Bur Middle School, 500m upstream Upson Road | 41.78036 | -72.98366 |
| 20876 | Little Dam Tavern Brook | PUTNAM | 100ft US Route 44 behind CVS parking lot | 41.92473 | -71.87576 |
| 20877 | Conantville Brook | MANSFIELD | 300ft DS Meadowbrook Ln adjacent to Sunny Acres Park | 41.73302 | -72.21193 |
| 20878 | Cooks Pond outlet; unnamed brook ("Cooktown Pond outlet") | PRESTON | 150ft DS Cook Town Road | 41.49733 | -71.97479 |
| 20879 | Scranton Brook | UNION | 150ft US Scranton Road in Yale Myers Forest | 41.98181 | -72.16480 |
| 20880 | Safford Brook | WOODSTOCK | 150ft DS Smith Road | 41.95030 | -72.03423 |
| 20881 | Elbow Brook | EAST HAMPTON | Approx. 200m US of Salmon River | 41.51939 | -72.48238 |
| 20882 | Burnham Brook | EAST HADDAM | Located on Burnham Brook Preserve about 80ft from Blue trail | 41.46596 | -72.32125 |
| 20883 | Harris Brook | SALEM | Stream located at bridge near Red Trail - break off near field | 41.47259 | -72.28619 |
| 20884 | Fraser Brook | SALEM | 10ft before bridge to 30ft below bridge | 41.47778 | -72.25444 |
| 20885 | NNT to Farmington River | BARKHAMSTED | 30m downstream of Legion Road Bridge; American Legion State Forest | 41.93972 | -73.00972 |
| 20886 | Thompson Brook | AVON | Old Farms Rd. intersection with Thompson Rd; Avon Old Farms property | 41.77329 | -72.84018 |
| 20887 | Morgan Brook | BARKHAMSTED | Just upstream of bridge crossing Rt 318 | 41.90860 | -73.00068 |
| 20888 | Brothers Brook | GREENWICH | Southern end of Pomerance Park; along the Red trail | 41.04792 | -73.60081 |
| 20889 | Greenwich Creek | GREENWICH | Located in the Greenwich Country Club golf course | 41.05418 | -73.61020 |
Appendix B: Most Wanted Taxa by Site
This table provides a list of all the “most wanted” taxa found at each site. The table is sorted according to waterbody name, site ID, and then the date the sample was collected. A full list of all taxa found at each site can be downloaded from the Water Quality Portal.
| Waterbody Name | Station ID | Date Collected | Family | Final ID |
|---|---|---|---|---|
| Barbour Brook | 16379 | 10/8/2023 | Perlidae | Acroneuria |
| Barrow’s Brook | 15594 | 10/28/2023 | Brachycentridae | Adicrophleps hitchcocki |
| Barrow’s Brook | 15594 | 10/28/2023 | Peltoperlidae | Tallaperla |
| Barrow’s Brook | 15594 | 10/28/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Beaver Brook | 15680 | 9/20/2023 | Chloroperlidae | Sweltsa |
| Beaver Brook | 15680 | 9/20/2023 | Peltoperlidae | Tallaperla |
| Beaver Brook | 15680 | 9/20/2023 | Perlidae | Acroneuria |
| Beaver Brook | 15680 | 9/20/2023 | Pteronarcyidae | Pteronarcys biloba |
| Beaver Brook | 15680 | 9/20/2023 | Glossosomatidae | Glossosoma |
| Big Brook | 17992 | 9/6/2023 | Rhyacophilidae | Rhyacophila |
| Big Brook | 17992 | 9/6/2023 | Perlidae | Acroneuria abnormis |
| Bigelow Brook | 20373 | 9/9/2023 | Chloroperlidae | Sweltsa |
| Bigelow Brook | 20373 | 9/9/2023 | Perlidae | Eccoptura xanthenes |
| Bigelow Brook | 20373 | 9/9/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Bigelow Brook | 20373 | 9/9/2023 | Peltoperlidae | Tallaperla |
| Blackledge River | 19455 | 10/17/2023 | Isonychiidae | Isonychia |
| Blackledge River | 19455 | 10/17/2023 | Perlidae | Acroneuria abnormis |
| Blackledge River | 19455 | 10/17/2023 | Glossosomatidae | Glossosoma |
| Bradley Brook | 14608 | 10/14/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Bradley Brook | 14608 | 10/14/2023 | Perlodidae | Isoperla |
| Burnham Brook | 20492 | 5/5/2023 | Perlodidae | Isoperla |
| Burnham Brook | 20492 | 5/5/2023 | Rhyacophilidae | Rhyacophila carolina |
| Burnham Brook | 20882 | 11/3/2023 | Perlidae | Perlidae |
| Burnham Brook | 20882 | 11/3/2023 | Peltoperlidae | Tallaperla |
| Burnham Brook | 20882 | 11/3/2023 | Taeniopterygidae | Taeniopteryx |
| Burnham Brook | 20882 | 11/3/2023 | Perlodidae | Perlodidae |
| Carmel Hill Brook | 20486 | 9/17/2023 | Peltoperlidae | Tallaperla |
| Carmel Hill Brook | 20486 | 9/17/2023 | Perlidae | Eccoptura xanthenes |
| Carmel Hill Brook | 20486 | 9/17/2023 | Rhyacophilidae | Rhyacophila carolina |
| Carmel Hill Brook | 20486 | 9/17/2023 | Isonychiidae | Isonychia |
| Cedar Brook | 15501 | 10/27/2023 | Capniidae | Capniidae |
| Cedar Brook | 15501 | 10/27/2023 | Perlidae | Acroneuria abnormis |
| Conantville Brook | 20877 | 11/15/2023 | Taeniopterygidae | Taeniopteryx |
| Conantville Brook | 20877 | 11/15/2023 | Glossosomatidae | Glossosoma |
| Conantville Brook | 20877 | 11/15/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Conantville Brook | 20877 | 11/15/2023 | Capniidae | Capniidae |
| Cranberry Meadow Brook | 20375 | 10/31/2023 | Perlidae | Perlidae |
| Cranberry Meadow Brook | 20375 | 10/31/2023 | Peltoperlidae | Tallaperla |
| Cranberry Meadow Brook | 20375 | 10/31/2023 | Leuctridae | Leuctra |
| East Meadow Brook | 18993 | 9/16/2023 | Isonychiidae | Isonychia |
| East Meadow Brook | 18993 | 9/16/2023 | Glossosomatidae | Glossosomatidae |
| East Meadow Brook | 18993 | 9/16/2023 | Perlidae | Acroneuria |
| Elbow Brook | 20881 | 10/1/2023 | Perlidae | Acroneuria |
| Elbow Brook | 20881 | 10/1/2023 | Peltoperlidae | Tallaperla |
| Elbow Brook | 20881 | 10/1/2023 | Rhyacophilidae | Rhyacophila |
| Elbow Brook | 20881 | 10/1/2023 | Apataniidae | Apatania |
| Elbow Brook | 20881 | 10/1/2023 | Glossosomatidae | Glossosoma |
| English Neighborhood Brook | 17867 | 11/12/2023 | Isonychiidae | Isonychia |
| English Neighborhood Brook | 17867 | 11/12/2023 | Taeniopterygidae | Taeniopteryx |
| English Neighborhood Brook | 17867 | 11/12/2023 | Glossosomatidae | Glossosomatidae |
| English Neighborhood Brook | 17867 | 11/12/2023 | Rhyacophilidae | Rhyacophila fuscula |
| English Neighborhood Brook | 17867 | 11/12/2023 | Peltoperlidae | Tallaperla |
| English Neighborhood Brook | 17867 | 11/12/2023 | Apataniidae | Apatania |
| English Neighborhood Brook | 17867 | 11/12/2023 | Capniidae | Capniidae |
| Fawn Brook | 18409 | 10/17/2023 | Glossosomatidae | Glossosoma |
| Fawn Brook | 18409 | 10/17/2023 | Isonychiidae | Isonychia |
| Fawn Brook | 18409 | 10/17/2023 | Perlidae | Acroneuria abnormis |
| Fawn Brook | 18409 | 10/17/2023 | Chloroperlidae | Chloroperlidae |
| Flat Brook | 16121 | 9/16/2023 | Chloroperlidae | Sweltsa |
| Flat Brook | 16121 | 9/16/2023 | Brachycentridae | Brachycentrus appalachia |
| Flat Brook | 16121 | 9/16/2023 | Isonychiidae | Isonychia |
| Flat Brook | 16121 | 9/16/2023 | Perlidae | Acroneuria abnormis |
| Fourmile River | 17322 | 10/24/2023 | Brachycentridae | Brachycentrus numerosus |
| Fourmile River | 17322 | 10/24/2023 | Perlidae | Acroneuria |
| Fraser Brook | 18961 | 4/28/2023 | Perlidae | Acroneuria abnormis |
| Fraser Brook | 18961 | 4/28/2023 | Heptageniidae | Epeorus |
| Fraser Brook | 18961 | 4/28/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Fraser Brook | 18961 | 4/28/2023 | Chloroperlidae | Sweltsa |
| Fraser Brook | 20884 | 11/3/2023 | Perlidae | Acroneuria abnormis |
| Fraser Brook | 20884 | 11/3/2023 | Peltoperlidae | Tallaperla |
| Harris Brook | 15313 | 4/28/2023 | Isonychiidae | Isonychia |
| Harris Brook | 15313 | 4/28/2023 | Perlidae | Acroneuria abnormis |
| Harris Brook | 15313 | 4/28/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Harris Brook | 15313 | 4/28/2023 | Glossosomatidae | Agapetus |
| Harris Brook | 19214 | 4/28/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Harris Brook | 19214 | 4/28/2023 | Ephemerellidae | Drunella |
| Harris Brook | 19214 | 4/28/2023 | Perlidae | Acroneuria abnormis |
| Harris Brook | 19214 | 4/28/2023 | Brachycentridae | Micrasema |
| Harris Brook | 19214 | 4/28/2023 | Isonychiidae | Isonychia |
| Harris Brook | 19214 | 4/28/2023 | Glossosomatidae | Agapetus |
| Harris Brook | 19214 | 10/27/2023 | Peltoperlidae | Tallaperla |
| Harris Brook | 19214 | 10/27/2023 | Perlidae | Paragnetina media |
| Harris Brook | 19214 | 10/27/2023 | Isonychiidae | Isonychia |
| Harris Brook | 20883 | 11/3/2023 | Perlidae | Paragnetina media |
| Harris Brook | 20883 | 11/3/2023 | Capniidae | Capniidae |
| Harris Brook | 20883 | 11/3/2023 | Glossosomatidae | Glossosoma |
| Harris Brook | 20883 | 11/3/2023 | Isonychiidae | Isonychia |
| Hedge Brook | 20126 | 5/5/2023 | Rhyacophilidae | Rhyacophila carolina |
| Hedge Brook | 20126 | 5/5/2023 | Perlodidae | Isoperla |
| Hedge Brook | 20126 | 5/5/2023 | Nemouridae | Amphinemura |
| Hedge Brook | 20126 | 11/3/2023 | Peltoperlidae | Tallaperla |
| Hedge Brook | 20126 | 11/3/2023 | Perlidae | Eccoptura xanthenes |
| Indian Meadow Brook | 14842 | 10/16/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Indian Meadow Brook | 14842 | 10/16/2023 | Chloroperlidae | Sweltsa |
| Indian Meadow Brook | 14842 | 10/16/2023 | Isonychiidae | Isonychia |
| Indian Meadow Brook | 14842 | 10/16/2023 | Glossosomatidae | Glossosoma |
| Indian Meadow Brook | 14842 | 10/16/2023 | Perlidae | Acroneuria |
| Indian Meadow Brook | 14842 | 10/16/2023 | Heptageniidae | Epeorus |
| Indian Meadow Brook | 14842 | 10/16/2023 | Peltoperlidae | Tallaperla |
| Indian Meadow Brook | 14842 | 10/16/2023 | Taeniopterygidae | Taeniopteryx |
| Latimer Brook | 18413 | 10/24/2023 | Brachycentridae | Brachycentrus numerosus |
| Latimer Brook | 18413 | 10/24/2023 | Perlidae | Acroneuria |
| Latimer Brook | 18495 | 10/24/2023 | Glossosomatidae | Glossosoma |
| Latimer Brook | 18495 | 10/24/2023 | Brachycentridae | Brachycentrus numerosus |
| Latimer Brook | 18495 | 10/24/2023 | Perlidae | Acroneuria |
| Little Dam Tavern Brook | 20876 | 11/16/2023 | Apataniidae | Apatania |
| Little Dam Tavern Brook | 20876 | 11/16/2023 | Brachycentridae | Micrasema |
| Little Dam Tavern Brook | 20876 | 11/16/2023 | Perlidae | Eccoptura xanthenes |
| Little Dam Tavern Brook | 20876 | 11/16/2023 | Taeniopterygidae | Taeniopteryx |
| Moodus River | 18871 | 11/12/2023 | Perlidae | Acroneuria abnormis |
| Moodus River | 18871 | 11/12/2023 | Taeniopterygidae | Taeniopteryx |
| Moodus River | 18871 | 11/12/2023 | Capniidae | Capniidae |
| Moodus River | 18871 | 11/12/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Moosehorn Brook | 16861 | 10/31/2023 | Perlidae | Acroneuria |
| Moosehorn Brook | 16861 | 10/31/2023 | Rhyacophilidae | Rhyacophila acutiloba |
| Moosehorn Brook | 16861 | 10/31/2023 | Pteronarcyidae | Pteronarcys |
| Morgan Brook | 20887 | 9/17/2023 | Chloroperlidae | Sweltsa |
| Morgan Brook | 20887 | 9/17/2023 | Pteronarcyidae | Pteronarcys biloba |
| Morgan Brook | 20887 | 9/17/2023 | Rhyacophilidae | Rhyacophila |
| Morgan Brook | 20887 | 9/17/2023 | Isonychiidae | Isonychia |
| Morgan Brook | 20887 | 9/17/2023 | Perlidae | Paragnetina |
| Muddy Brook | 18694 | 5/5/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Muddy Brook | 18694 | 5/5/2023 | Peltoperlidae | Tallaperla |
| Muddy Brook | 18694 | 5/5/2023 | Heptageniidae | Epeorus |
| Muddy Brook | 18694 | 5/5/2023 | Perlidae | Acroneuria abnormis |
| NNT to Bunnell Brook | 20666 | 10/4/2023 | Perlidae | Perlidae |
| NNT to Bunnell Brook | 20666 | 10/4/2023 | Leuctridae | Leuctra |
| NNT to Bunnell Brook | 20666 | 10/4/2023 | Chloroperlidae | Sweltsa |
| NNT to Bunnell Brook | 20666 | 10/4/2023 | Rhyacophilidae | Rhyacophila |
| NNT to Bunnell Brook | 20666 | 10/4/2023 | Peltoperlidae | Tallaperla |
| NNT to Eightmile at Pleasant Valley Preserve | 15314 | 5/5/2023 | Rhyacophilidae | Rhyacophila |
| NNT to Eightmile at Pleasant Valley Preserve | 15314 | 5/5/2023 | Perlodidae | Isoperla |
| NNT to Eightmile at Pleasant Valley Preserve | 15314 | 10/27/2023 | Peltoperlidae | Tallaperla |
| NNT to Eightmile at Pleasant Valley Preserve | 15314 | 10/27/2023 | Perlidae | Perlidae |
| NNT to Farmington River | 20885 | 9/19/2023 | Brachycentridae | Adicrophleps hitchcocki |
| NNT to Farmington River | 20885 | 9/19/2023 | Chloroperlidae | Sweltsa |
| NNT to Farmington River | 20885 | 9/19/2023 | Perlodidae | Perlodidae |
| NNT to Farmington River | 20885 | 9/19/2023 | Peltoperlidae | Tallaperla |
| NNT to Farmington River | 20885 | 9/19/2023 | Rhyacophilidae | Rhyacophila |
| NNT to Shepaug River | 18922 | 9/25/2023 | Glossosomatidae | Glossosoma |
| NNT to Shepaug River | 18922 | 9/25/2023 | Peltoperlidae | Tallaperla |
| Peake Brook | 17650 | 10/26/2023 | Glossosomatidae | Glossosoma |
| Peake Brook | 17650 | 10/26/2023 | Brachycentridae | Brachycentrus numerosus |
| Peake Brook | 17650 | 10/26/2023 | Perlidae | Eccoptura xanthenes |
| Peake Brook | 17650 | 10/26/2023 | Peltoperlidae | Tallaperla |
| Peake Brook | 17650 | 10/26/2023 | Rhyacophilidae | Rhyacophila |
| Peake Brook | 17650 | 10/26/2023 | Apataniidae | Apatania |
| Peake Brook | 17650 | 10/26/2023 | Capniidae | Capniidae |
| Peckham Brook | 17731 | 10/16/2023 | Capniidae | Paracapnia |
| Peckham Brook | 17731 | 10/16/2023 | Perlidae | Eccoptura xanthenes |
| Peckham Brook | 17731 | 10/16/2023 | Peltoperlidae | Tallaperla |
| Peckham Brook | 17731 | 10/16/2023 | Glossosomatidae | Glossosoma |
| Peckham Brook | 17731 | 10/16/2023 | Rhyacophilidae | Rhyacophila carolina |
| Pine Brook | 14396 | 10/18/2023 | Chloroperlidae | Sweltsa |
| Pine Brook | 14396 | 10/18/2023 | Glossosomatidae | Glossosoma |
| Pine Brook | 14396 | 10/18/2023 | Capniidae | Capniidae |
| Pine Brook | 14396 | 10/18/2023 | Perlidae | Acroneuria abnormis |
| Railroad Brook | 16995 | 10/28/2023 | Glossosomatidae | Glossosoma |
| Railroad Brook | 16995 | 10/28/2023 | Perlidae | Acroneuria abnormis |
| Railroad Brook | 16995 | 10/28/2023 | Capniidae | Capniidae |
| Railroad Brook | 16995 | 10/28/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Ransom Brook | 19215 | 4/28/2023 | Perlodidae | Isoperla |
| Ransom Brook | 19215 | 4/28/2023 | Perlidae | Paragnetina media |
| Ransom Brook | 19215 | 4/28/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Ransom Brook | 19215 | 10/27/2023 | Perlidae | Paragnetina media |
| Ransom Brook | 19215 | 10/27/2023 | Brachycentridae | Brachycentrus numerosus |
| Ransom Brook | 19215 | 10/27/2023 | Peltoperlidae | Tallaperla |
| Raymond Brook | 16999 | 10/29/2023 | Taeniopterygidae | Taeniopteryx |
| Raymond Brook | 16999 | 10/29/2023 | Perlidae | Paragnetina media |
| Raymond Brook | 16999 | 10/29/2023 | Brachycentridae | Micrasema |
| Raymond Brook | 16999 | 10/29/2023 | Glossosomatidae | Glossosoma |
| Raymond Brook | 16999 | 10/29/2023 | Isonychiidae | Isonychia |
| Reichenbach Brook | 20154 | 9/16/2023 | Rhyacophilidae | Rhyacophila |
| Reichenbach Brook | 20154 | 9/16/2023 | Glossosomatidae | Glossosomatidae |
| Reichenbach Brook | 20154 | 9/16/2023 | Perlidae | Acroneuria |
| Rickenback Brook | 20371 | 10/28/2023 | Perlidae | Eccoptura xanthenes |
| Safford Brook | 20880 | 11/17/2023 | Taeniopterygidae | Taeniopteryx |
| Safford Brook | 20880 | 11/17/2023 | Glossosomatidae | Glossosoma |
| Safford Brook | 20880 | 11/17/2023 | Perlidae | Eccoptura xanthenes |
| Safford Brook | 20880 | 11/17/2023 | Apataniidae | Apatania |
| Safford Brook | 20880 | 11/17/2023 | Lepidostomatidae | Lepidostoma |
| Safford Brook | 20880 | 11/17/2023 | Heptageniidae | Epeorus |
| Safford Brook | 20880 | 11/17/2023 | Perlodidae | Perlodidae |
| Safford Brook | 20880 | 11/17/2023 | Chloroperlidae | Sweltsa |
| Safford Brook | 20880 | 11/17/2023 | Capniidae | Capniidae |
| Safford Brook | 20880 | 11/17/2023 | Peltoperlidae | Tallaperla |
| Salmon Brook | 14435 | 9/2/2023 | Brachycentridae | Brachycentrus numerosus |
| Salmon Brook | 14435 | 9/2/2023 | Perlidae | Acroneuria abnormis |
| Salmon Brook | 14435 | 9/2/2023 | Glossosomatidae | Glossosoma |
| Salmon Brook | 14435 | 9/2/2023 | Isonychiidae | Isonychia |
| Salmon River | 17022 | 9/9/2023 | Heptageniidae | Epeorus |
| Salmon River | 17022 | 9/9/2023 | Isonychiidae | Isonychia |
| Salmon River | 17022 | 9/9/2023 | Glossosomatidae | Glossosoma |
| Salmon River | 17022 | 9/9/2023 | Perlidae | Acroneuria abnormis |
| Scranton Brook | 20879 | 11/30/2023 | Perlidae | Eccoptura xanthenes |
| Scranton Brook | 20879 | 11/30/2023 | Peltoperlidae | Tallaperla |
| Scranton Brook | 20879 | 11/30/2023 | Leuctridae | Leuctridae |
| Scranton Brook | 20879 | 11/30/2023 | Lepidostomatidae | Lepidostoma |
| Scranton Brook | 20879 | 11/30/2023 | Nemouridae | Nemouridae |
| Scranton Brook | 20879 | 11/30/2023 | Taeniopterygidae | Taeniopterygidae |
| Scranton Brook | 20879 | 11/30/2023 | Chloroperlidae | Sweltsa |
| Scranton Brook | 20879 | 11/30/2023 | Rhyacophilidae | Rhyacophila carolina |
| Scranton Brook | 20879 | 11/30/2023 | Glossosomatidae | Glossosomatidae |
| Thompson Brook | 20886 | 10/26/2023 | Perlidae | Acroneuria |
| Thompson Brook | 20886 | 10/26/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Wood Creek | 17333 | 9/16/2023 | Perlodidae | Perlodidae |
| Wood Creek | 17333 | 9/16/2023 | Chloroperlidae | Sweltsa |
| Wood Creek | 17333 | 9/16/2023 | Rhyacophilidae | Rhyacophila fuscula |
| Wood Creek | 17333 | 9/16/2023 | Heptageniidae | Epeorus |
| Wood Creek | 17333 | 9/16/2023 | Perlidae | Acroneuria |
| Wood Creek | 17333 | 9/16/2023 | Pteronarcyidae | Pteronarcys biloba |
| Wood Creek | 17333 | 9/16/2023 | Peltoperlidae | Tallaperla |
| Wood Creek | 17333 | 9/16/2023 | Isonychiidae | Isonychia |